US4106067A - Magnetic head cleaning jacket - Google Patents

Magnetic head cleaning jacket Download PDF

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Publication number
US4106067A
US4106067A US05/724,430 US72443076A US4106067A US 4106067 A US4106067 A US 4106067A US 72443076 A US72443076 A US 72443076A US 4106067 A US4106067 A US 4106067A
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United States
Prior art keywords
cleaning
jacket
layer
sheet
cleaning sheet
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Expired - Lifetime
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US05/724,430
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English (en)
Inventor
Kenichi Masuyama
Tsutomu Sugisaki
Tatsuji Kitamoto
Yasuyuki Yamada
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Fujifilm Holdings Corp
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Fuji Photo Film Co Ltd
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    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
    • G11B5/41—Cleaning of heads

Definitions

  • This invention relates to a cleaning jacket for a magnetic recording head, particularly for one for use with flexible discs.
  • magnetic memory recording methods can be classified into those using a magnetic disc, magnetic tape, cassette tape, etc., each of which has the following problems: the magnetic disc method is, in spite of its high recording density, costly; the magnetic tape method requires a large space which makes this method inferior to the former in handling; and the cassette tape method, characterized by compactness, suffers from a low recording volume as well as poor reliability.
  • the flexible disc method which has many advantages and is free of the above disadvantages, among these methods, i.e., high recording density and a compactness sufficient for easy handling, has recently prevailed in popularity.
  • Such abrasion and accumulation of lubricant can be reduced by improving the magnetic recording layer.
  • the recording head In the case of a flexible disc, the recording head is usually located in the innermost part of the apparatus, which makes it difficult to easily carry out head cleaning using a piece of cloth impregnated with a cleaning liquid as in the case of open reel tape recorders, cassette recorders and hame or broadcasting video recorders.
  • head cleaning tapes which comprise a support such as polyester film and a cleaning layer consisting of an abrasive such as fused alumina, silicon carbide, chromium oxide (Cr 2 O 3 ), corundum, etc., bonded with a suitable binder are conveniently used for the above-cited various types of magnetic heads.
  • cleaning tape effectively grinds off smudges on the head mainly comprising abraded recording layer and lubricant, it also tends to abrade the head itself to an undesirable degree. Such problems are also encountered in the case of heads for magnetic video recorders.
  • Objects of the present invention are, therefore, to resolve the shortcomings and the inconveniences involved in conventional cleaning methods or devices for flexible disk magnetic heads, to accomplish cleaning in a very short period without promoting head abrasion, and to provide cleaning jackets of reasonable price with good handling conveniency.
  • a cleaning jacket which comprises a cleaning sheet and a sheet storage jacket, the cleaning sheet comprising a flexible and non-magnetizable support on one surface of which is provided a cleaning layer of a fibrous material and at least on the other surface of which is coated an antistatic layer (the fibrous material may be provided on a second antistatic layer, if desired), and the jacket accomadating the cleaning sheet in such a manner that the sheet can freely rotate therein and being provided with a lubricating layer on the inner wall thereof facing the antistatic layer of said sheet.
  • FIG. 1 is a plane view of a cleaning sheet of the present invention.
  • FIG. 2 is a cross sectional view of the cleaning sheet of FIG. 1 cut along the line I--I' in FIG. 1.
  • FIG. 3 is a plane view of a jacket of the present invention.
  • FIG. 4 is a cross-sectional view of the jacket of FIG. 3 cut along line I--I' in FIG. 3.
  • FIG. 5 illustrates the jacket loaded in a flexible disk recorder in the state of a head cleaning operation.
  • FIGS. 6 - 8 correspondingly illustrate another embodiment of the present invention
  • FIG. 6 is a plane view of a cleaning sheet
  • FIG. 7 a cross-sectional view thereof cut along line I--I' of FIG. 6,
  • FIG. 8 shows the cleaning jacket loaded in a magnetic sheet recorder and operating to clean the magnetic head.
  • Numerals correspond to the following: 1 -- cleaning sheet; 2 -- support; 3 -- antistatic layer; 4 -- fibrous material layer; 10 -- cleaning jacket; and 15 lubricating layer.
  • FIGS. 1 and 2 are illustrated a cleaning sheet 1 which comprises a doughnut-shaped, flexible and non-magnetizable support 2 provided with a center hole 5 and an aperture 6 for a light sector (a light sector is often called an index hole in the art; this enables the recording position to be easily located in conventional recording devices).
  • a light sector is often called an index hole in the art; this enables the recording position to be easily located in conventional recording devices.
  • an antistatic layer 3 On one surface of the support 2 is coated an antistatic layer 3 and the other surface of the support 2 is provided a fibrous material layer 4.
  • Support 2 can be freely selected from non-magnetic flexible materials, applying conventional techniques in the art.
  • Suitable materials for support 2 include plastic sheets such as polyvinyl chloride, polycarbonate, acrylonitrile-styrene copolymers, ABS resin, polyesters, e.g., polyethylene terephthalate, alkyd resins, maleic acid resins, etc., glass fiber reinforced polyester, with useful polyesters being as earlier exemplified; a typical commercial example of such a material is ERP (glass fiber/tempered plastic; such are typically produced by combining an unsaturated polyester resin and a glass fiber, the glass fiber being selected from non-alkaline glass which is free of Na 2 O or K 2 O), cellulose derivatives, e.g., polyethylene terephthalate, alkyl resins, maleic acid resins, etc, paper or card board, metal plates comprising aluminum or copper, glass plates etc.
  • ERP glass fiber/tempered plastic
  • cellulose derivatives e.g., polyethylene terephthalate
  • a suitable thickness for support 2 is from about 10 ⁇ to about 1 mm, which can be selected depending upon the use of the apparatus.
  • Antistatic layer 3 can be prepared by coating a coating mixture comprising a finely-divided, electically conductive material such as carbon black, graphite, lamp black (acetylene black or thermal black, etc.), channel black (furnace black, etc.), etc., and a binder.
  • the finely-divided electrically conductive materials have a particle size of from about 15 ⁇ to about 400 ⁇ , even more preferably 20 ⁇ to 200 ⁇ .
  • the antistatic layer preferably exhibits a surface electrical resistance (after drying and coating) of about 1 ⁇ 10 12 ⁇ /sq., at highest even more preferably 5 ⁇ 10 9 ⁇ /sq., at highest.
  • Suitable binder materials include thermoplastic resins as are disclosed in the following Japanese Patent Publications Nos. 6877/1962, 12528/1964, 19282/1964, 5349/1965, 20907/1965, 9463/1966, 14059/1966, 16985/1966, 6428/1967, 11621/1967, 4623/1968, 15206/1968, 2889/1969, 17947/1969, 18232/1969, 14020/1970, 14500/1970, 18573/1972, 22063/1972, 22064/1972, 22069/1972, 22070/1972, 27886/1972, etc., and which have a softening point of 150° C or below, an average molecular weight of from about 10 4 to about 2 ⁇ 10 5 , and a degree of polymerization of from about 200 to about 500.
  • thermosetting type such as those comprising a polyether/diamine group, a polyester / diamine group, a polyester / glycol group, a polyether / glycol group, etc.
  • thermoplastic type e.g., polyvinyl fluoride, vinylidene chloride-acrylonitrile copolymers, butadiene-
  • Thermosetting resins such as are disclosed in the follwing Japanese Patent Publications can also be used: 8103/1964, 9779/1965, 7192/1966 (U.S. Pat. No. 3,437,510, 8016/1966 (U.S. application Ser. No. 308,692), 14275/1966 (U.S. Pat. No. 3,507,694), 18179/1967 (U.S. Pat. No. 3,404,997), 12081/1968 (U.S. Pat. No. 3,574,684), 28023/1969 (U.S. Pat. No.
  • thermosetting or reactive resins as they are sometimes termed at lower molecular weights
  • thermosetting desirably have a molecular weight not exceeding 2 ⁇ 10 5 when they are in coating liquid form, and when coated and heated after drying, increase in molecular weight to infinity via a condensation or addition reaction.
  • thermosetting resins such materials are preferred which do not soften or melt until thermal decomposition takes place, including, for example, phenol resins, epoxy resins, thermosetting polyurethane resins, urea-formaldehyde resins, melamine-formaldehyde resins, alkyd resins, silicone resins, acrylic functional resins, epoxy-polyamide resins, nitrocellulose-melamine resins, a mixture of a high molecular weight polyester resin with an isocyanate prepolymer, a mixture of a copolymer of methacrylic acid with a diisocyanate prepolymer, a mixture comprising a polyesterpolyol and a polyisocyanate, a mixture comprising a low molecular weight glycol, a high molecular weight diol and triphenylmethane triisocyanate, a polyamine resin, mixtures thereof, etc.
  • phenol resins epoxy resins
  • thermosetting polyurethane resins urea-formal
  • a finely-divided, electrically conductive material is mixed with a binder selected from the above cited materials in a weight/weight ratio of from 100 : 10 to 100 : 200, i.e., 100 parts of electrically conductive material in combination with from 10 to 200 parts of binder.
  • a dispersing aid for example, a lubricant, an abrasive, an organic solvent, etc., if desired or necessary, to prepare a coating mixture, which is coated on one surface of a support as hereinbefore described by any desired coating methods, e.g., as described in detail in "Coating Technology(Kohtingu Kohgaku)" published by Asakura Book Store (Mar. 20, 1971) at page 253-277, including air doctor, blade, air knife, squeeze, dip, reverse roll, transfer roll, gravure, kiss, cast, and spray coating.
  • a preferred range of the coating thickness is from 3 to 8 microns, usually from 1 to 10 microns, dry basis.
  • Fibrous material layer 4 can be formed by providing on the other side of support 2 a layer of a non-woven fabric, a synthetic leather, leather, woven cloth of synthetic or natural fibers, or Japanese paper fiber, using a suitable adhesive or by the application of heat and pressure (thermocompression bonding).
  • the amount of adhesive utilized is not limited in any particular fashion, so long as a desired adhesive effect is obtained.
  • the amounts utilized can be freely varied and will be obvious to one skilled in the art in view of the disclosure.
  • the heat and pressure selected for the thermocompressive bonding will obviously depend upon the type of binder selected; usually, a temperature on the order of about 80° to about 200° C is used for most thermoplastic and thermosetting materials.
  • the thickness of layer 4 is preferably from about 20 to about 200 microns, more preferably from 30 to 100 microns.
  • the general characteristics which any fibrous material must illustrate are that the coefficient of friction must be small and fiber pilling must scarcely occur to decrease rotary torque. To avoid “drop-out", the material should be soft and should provide a "cushioning" effect, and the fibrous material should illustrate low electrification capability.
  • Non-woven fabrics for use in cleaning layer 4 imply clothlike products produced by orienting fibers of, e.g., cellulose acetate fiber, nylon, polyester, etc., by a suitable means in the form of web or of mat, and by bonding the oriented fibers with an adhesive such as a natural latex, e.g., gum arabic, gum traganth, synthetic latices which may be used together with urea-formalkehyde resin, or melamine-formaldehyde resin, or by utilizing the adhesive force of the fibers themselves, e.g., when using polyethylene, polypropylene or a polyamide.
  • an adhesive such as a natural latex, e.g., gum arabic, gum traganth, synthetic latices which may be used together with urea-formalkehyde resin, or melamine-formaldehyde resin, or by utilizing the adhesive force of the fibers themselves, e.g., when using polyethylene, polyprop
  • Synthetic latices suited for such an adhesive include acrylonitrile-butadiene copolymers or other acrylonitrile copolymers, e.g., acrylonitrile-styrene copolymers, etc.
  • the coating or impregnation rate is generally from about 10 to about 150 wt.% of adhesive (solids content) based on the weight of the oriented fibers involved. Higher or lower amounts can be used, of course, and this range is to be construed as merely illustrative.
  • Non-woven fabrics of the heat-bondable type can also be used for the present invention, i.e., fusion bonding can be also used, e.g., polyesters, polystyrenes and polyvinyl acetate, with usually a temperature of about 70° to about 250° C being used for the bonding.
  • Suitable materials for woven cloth of a synthetic fiber include polyamides such as nylon-6,6, nylon-6,10, etc., polyesters such as polyethylene terephthalate, polyethylene naphthalate, etc., polyurethanes(which are a reaction product between a prepolymer prepared by reaction of a polyester or a polyether with a diisocyanate compound and a hydrazine, diamine or diol, for example, Spandex, which is produced by du Pont, under the tradename Lycra), polyolefins such as polyethylene or polypropylene, and other polymer materials such as polystyrene, polyvinyl chloride, polyvinylidene chloride, polyethylene fluoride, polyacrylonitrile, polyvinyl alcohol, etc.
  • Woven clothe of natural fibers comprises protein fibers such as wool, silk, etc., or cellulosic fibers such as cotton, jute, etc.
  • Typical examples of useful synthetic leathers are the polyurethane and/or vinyl chloride synthetic leathers.
  • Japanese paper is made from natural fibers, cellulose fibers being preferred, using bast fibers as a raw material, digesting the fibers to make single fibers and then making a paper therefrom.
  • Bast fibers consist of celluloses about 3 to about 50 mm long by about 0.01 to about 0.08 mm wide. Examples of such are flax, hemp, jute, ramie, kozo, mitsumata and gampi. Of these fibers, kozo, mitsumata and gampi are preferred.
  • fibrous materials can be bonded by an adhesive, or by the application of heat and pressure, to the other surface of the above-described support 2.
  • Such materials are most preferably impregnated into the fibrous layer in an amount of 0.5 wt.% to 10 wt.%, as solids basis, based on the weight of the fibrous layer.
  • a silicone oil e.g., SH 8400, SH 8412, produced by Toray Silicone K.K.
  • Silicone oil SH 8400 corresponds to DCFF-400 Fiber Finish of Dow Corning Corp.
  • SH 8412 corresponds to DC FF-412 Fiber FInish of Dow Corning Corp.
  • a fluorinated oil e.g., Daifloil produced by Daikin Kogyo K.K. (trifluorochloroethylene polymer of a low degree of polymerization
  • Synthetic latexes and such latexes in combination with a urea or melamine resin adhesive, a synthetic rubber examples include the same synthetic rubbers as are recited as suitable binder materials for the finely-divided, electrically conductive material
  • a polyester a vinyl acetate resin, a butyral resin, an acrylate resin, a vinyl chloride resin, a polyamide, a reclaimed rubber, starch, dextrin, glue, gum arabic, casein, polyvinyl alcohol, polyacrylamide, carboxymethyl cellulose, rosins, wax, paraffin, epoxy resins, isocyanate resins, phenyl resins, furan resins, nitrocellulose, etc.
  • the fibrous material When the fibrous material is bonded to the surface of support 2 by thermocompression bonding, it is necessary that either of the fibrous material, a material comprising the fibrous material at least in part, e.g., a surface layer, or the support 2 contains a thermoplastic material (for example, the adhesive for a non-woven fabric may contain a thermoplastic material; preferred thermoplastic materials have a softening temperature of 150° C or less, an average molecular weight of 10,000 to 200,000 and a degree of polymerization of 200 to 500.); more preferably, both of these contain a thermoplastic material.
  • a thermoplastic material for example, the adhesive for a non-woven fabric may contain a thermoplastic material; preferred thermoplastic materials have a softening temperature of 150° C or less, an average molecular weight of 10,000 to 200,000 and a degree of polymerization of 200 to 500.
  • FIGS. 3 and 4 there is illustrated a jacket 10 of the flat case type comprising a 1 to 5 mm thick paper board or hard vinyl chloride plate and enclosing a space in which the cleaning sheet 1 described above can freely rotate.
  • Jacket 10 has at its side wall an opening 11 through which the cleaning sheet 1 can be inserted and removed, and in each of top cover 10a and the bottom plate 10b there is provided a center hole 12 of slightly greater diameter than center hole 5 of the sheet, another hole 13 also slightly greater than aperture 6 of the sheet for the light sector, and a linear aperture 14 through which a magnetic head can be inserted. Hole 13 may be eliminated when a light sector is not used.
  • lubricating layer 15 for the purpose of insuring smooth rotation of cleaning sheet 1.
  • a lubricating layer 15 which can be prepared by substantially the same methods as those described hereinbefore for the preparation of the fibrous layer 4, comprises a synthetic paper, e.g., a synthetic paper such as a mixture of wood pulp and NBR at a wt. ratio of pulp : NBR of 1 : 0.1 - 1, or non-woven fabric impreganted with a silicone resin, Teflon, a silicone oil, etc.
  • useful non-woven fabrics include those which are used to form the cleaning sheet.
  • useful silicone oil examples include SH 8400 (produced by Toray Silicon K.K.), SH 8412 (produced by Toray Silicon K.K.), KF 96 (Shinetsu Chemical Co., Ltd.) and SF 96 (produced by G.E.), and examples of silicone resins include copolymers of dimethylpolysiloxane, monomethylpolysiloxane and polysiloxanes and the like.
  • the cleaning jacket of the present invention comprises such a jacket 10 and a cleaning sheet 1 installed in the jacket in the manner as illustrated in FIG. 4.
  • Cleaning sheet 1 installed in jacket 10 as shown in FIG. 4 is loaded in a flexible disk recorder 30 together with jacket 10 as is shown in FIG. 5.
  • Cleaning sheet 1 is rotated as a flexible magnetic disk, whereby cleaning sheet 1 begins to rotate very smoothly with a markedly reduced starting torque due to the lubricating action of the lubricating layer 15 assisted by the antistatic effect of anti-static layer 3.
  • a pre-determined rate of rotation for example, with a floppy disc of the IBM 3740 type 360 rpm, and for a magnetic sheet, 3600 rpm
  • magnetic head 31 is inserted downwardly through linear aperture 14 in upper cover 10a and brought into frictional contact with fibrous layer 4 of sheet 1.
  • load pad 32 is applied against the rear surface of the sheet through linear aperture 14 in the bottom plate 10b to prevent the sheet from hanging down or drooping due to the contact with the magnetic head 31.
  • the duration of contact is from several to several ten seconds, usually at least 10 seconds, and dust, foreign substances, smudges, etc., adhering to head 31 are almost perfectly wiped off onto fibrous layer 4.
  • cleaning of the head surface is finished in a very short time.
  • the shape of cleaning sheet 1 and jacket 10 can be circular, elliptic or rectangular, so long as the jacket cleaning sheet 1 can rotate without disturbance.
  • FIGS. 6, 7 and 8 Other practical embodiments of jackets designed according to the present invention are further illustrated in FIGS. 6, 7 and 8 wherein cleaning sheet 1 is characterized by an antistatic layer provided on both sufaces of support 2 and a fibrous layer 4 is provided on one surface of the antistatic layer.
  • jacket 10 retaining cleaning sheet 1 has essentially an equivalent structure and performs the same functions as those described hereinbefore, i.e., it is characterized by one inner wall which faces antistatic layer 3 which has no fibrous material layer thereon being provided with lubricating layer 15 as earlier described.
  • Cleaning jackets thus constructed exhibit an improved antistatic effect in the cleaning of a magnetic head, and impart a more reduced starting torque to the cleaning sheet, thus enabling it to rotate very smoothly.
  • Cleaning jackets described heretofore and produced in accordance with the present invention have the following, advantages: 1) Antistatic layer 3 provided on at least one suface of the support remarkably reduces electrostatic charges frictionally generated when cleaning sheet 1 begins to rotate, and consequently the starting torque is markedly reduced, ensuring very soomth rotation of the sheet. 2) Lubricating layer 15 provided on the inner wall of jacket 10, the wall facing an antistatic layer 3 which is provided on the surface other than that coated with fibrous material layer 4, noticeably lowers the frictional resistance of cleaning sheet 1 at the start of rotation as well as during the rotation thereof, thus considerably reducing the starting torque of sheet 1 as well as the frictional wearing of the sheet.
  • An antistatic layer was provided on one surface of a 75 micron thick polyethylene terephthalate film support by coating a coating mixture of the following composition so as to give a dry thickness of 3 microns by gravure coating and then drying.
  • thermoplastic adhesive (Stafix, a product of Fuji Photo Film Co., Ltd.; polyester adhesive comprising an aromatic dibasic acid and two or more glycols; thickness on the order 10 ⁇ to 50 ⁇ ), on which layer a non-woven fabric 200 microns thick (Vilene #3000, a product of Japan Vilene Co., a copolymer of polyethylene terephthalate (60 mol%) and rayon (40 mol%) bonded using styrenebutadiene rubber as an adhesive and formed into a sheet.) was laminated by appling 1 Kg/cm pressure at 100° C[heating for one minute use a pair of heated pressure rollers(the time, of course, is not limited; in this particular example, the diameter of the heating roll was 40 cm, the web being passed around one heating roll prior to passing between the two heating rolls; typically, the contact time is on the order of 1 second to 2 minutes)]. After cooling to room temperature, the resulting film was cut
  • a flat case as shown in FIG. 3 was formed of a 0.25 mm thick hard polyvinyl chloride resin sheet.
  • a 200 micron thick nonwoven fabric layer (Vilene TR-35, a product of Sanko Vilene Co.) impregnated with silicone oil (the rate of impregnation with silicon oil was 1 to 2 wt.%, based on the weight of the fabric layer), by means of a hot press at 1 Kg/cm 2 and 200° C.
  • the resulting jacket had planer dimensions of 20.5 cm ⁇ 20.5 cm with an inner space for the cleaning sheet of 1.0 mm in the direction of sheet thickness.
  • the cleaning sheet and the jacket thus produced were loaded in a flexible disc recorder as shown in FIG. 5.
  • the sheet was rotated at 360 r.p.m. and the magnetic head was brought into frictional contact from above with the fibrous material layer of the sheet, the condition of the rotating sheet was observed and the electric resistance of the lower surface of the sheet was measured (the lower surface means not the fibrous material layer but the other surface having the antistatic layer.)
  • Example 1 On one surface of the resulting film was provided a layer the same as the layer of the same non-woven fabric as in Example 1 by the same method as in Example 1. Further, the film was similarly processed to provided a doughnut-shaped cleaning sheet. A jacket was produced in the same manner as in Example 1 to obtain a jacket of the same material, shape and size as in Example 1.
  • the cleaning sheet and the jacket thus produced were loaded in a flexible disc recorder in the manner as shown in FIG. 5.
  • the sheet was rotated at 360 r.p.m., and the magnetic head was brought into frictional contact from above with the fibrous material layer of the sheet, the condition of the rotating sheet was observed and the electric resistance of the lower surface of the sheet was measured.
  • the lower surface implies not the fibrous material layer but the surface having the antistatic layer).
  • a coating mixture of the following composition was coated and dried to prepare a cleaning sheet with an abrasive layer, the abrasive layer being about 3 to 8 u thick.
  • the film was cut into pieces in the same manner as in Example 1.
  • the doughnut-shaped sheet was installed in a jacket which was equivalent to the one described in Example 1 except that it had no lubricating layer on its inside wall, and the jacket with the sheet was loaded into a flexible disc recorder.
  • the cleaning sheet was rotated at 360 r.p.m. and the magnetic head was brought into frictional contact from above with the rotating sheet, the stability of the sheet rotation was observed and the electric resistance of the lower surface of the sheet was measured (the lower surface corresponds, in this case, to the untreated surface of the polyvinyl chloride sheet).
  • the sheet was subjected to surface electric resistance measurement at the lower surface immediately after it stopped.
  • the value was 10 16 to 10 14 ⁇ /sq.

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US05/724,430 1975-09-19 1976-09-17 Magnetic head cleaning jacket Expired - Lifetime US4106067A (en)

Applications Claiming Priority (2)

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JP50-128741[U] 1975-09-19
JP1975128741U JPS5554822Y2 (enrdf_load_stackoverflow) 1975-09-19 1975-09-19

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US (1) US4106067A (enrdf_load_stackoverflow)
JP (1) JPS5554822Y2 (enrdf_load_stackoverflow)
CA (1) CA1072678A (enrdf_load_stackoverflow)
DE (1) DE2641943C2 (enrdf_load_stackoverflow)

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US4180840A (en) * 1978-03-29 1979-12-25 Burroughs Corporation Cleaning disk assembly for oppositely-oriented, dual-component magnetic transducers
DE3008137A1 (de) * 1979-03-15 1980-09-25 Innovative Computer Prod Vorrichtung und verfahren zum abriebfreien reinigen von magnetkoepfen
US4251843A (en) * 1977-03-08 1981-02-17 Fuji Photo Film Co., Ltd. Disc jacket for retaining magnetic recording disc
US4291353A (en) * 1979-06-04 1981-09-22 Texas Instruments Incorporated System and method for cleaning a magnetic head transducer
WO1982000731A1 (en) * 1980-08-25 1982-03-04 Computer Prod Innovative Non-abrasive magnetic head cleaning system
EP0056317A1 (en) * 1981-01-14 1982-07-21 Verbatim Corporation Cleaning disk assembly, cleaning disk and envelope
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US4354213A (en) * 1980-06-02 1982-10-12 Verbatim Corporation Self-lubricating liner
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US4419164A (en) * 1980-06-02 1983-12-06 Verbatim Corporation Method for making a self-lubricating liner
US4490765A (en) * 1983-09-01 1984-12-25 Yoshiro Nakamats Diskette for cleaning a floppy-disc drive head
US4499516A (en) * 1982-02-08 1985-02-12 Perfect Data Corporation Cleaning disk with opaque ring
US4516176A (en) * 1982-05-10 1985-05-07 Verbatim Corporation Magnetic head cleaning diskette
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US4558386A (en) * 1982-06-04 1985-12-10 Ssk Enterprises, Inc. Head cleaner for floppy disk drive
US4589044A (en) * 1983-04-19 1986-05-13 Minnesota Mining And Manufacturing Company Head-cleaning diskette having jacket with removable tab
US4704648A (en) * 1985-03-12 1987-11-03 Visa Technologies, Inc. Laminated head cleaning disk
US4734145A (en) * 1985-02-22 1988-03-29 Visa Technologies, Inc. Method for making a magnetic transducer head cleaning card
US4755246A (en) * 1985-03-12 1988-07-05 Visa Technologies, Inc. Method of making a laminated head cleaning disk
US4845583A (en) * 1987-05-07 1989-07-04 Bonar Fabrics Corporation Record diskette or disk jackets lined with powder bonded nonwoven fabrics
US4868699A (en) * 1985-03-27 1989-09-19 Automation Facilities Limited Microfloppy disc drive head cleaner
US4916564A (en) * 1983-11-18 1990-04-10 Ryan Plastics Ireland Limited Cleaning apparatus for a disc drive
US5060105A (en) * 1990-04-16 1991-10-22 International Paper Company Hybrid nonwoven diskette liner
US5311389A (en) * 1990-04-16 1994-05-10 International Paper Company Hydroentangled fabric diskette liner
US5355271A (en) * 1992-02-07 1994-10-11 Matsushita Electric Industrial Co., Ltd. Tape cassette with resiliently mounted tape cleaner
US5398151A (en) * 1993-10-29 1995-03-14 Minnesota Mining And Manufacturing Company Diskette liner
US5695374A (en) * 1994-09-21 1997-12-09 Kao Corporation Nonwoven fabric for liners of floppy disk and process for producing the same
US6075682A (en) * 1998-07-08 2000-06-13 Bba Nonwovens Simpsonville, Inc. Diskette liner with film and web layers
US20160122593A1 (en) * 2013-06-26 2016-05-05 Nitto Denko Corporation Adhesive tape for preventing aquatic biofouling

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Cited By (35)

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Publication number Priority date Publication date Assignee Title
US4251843A (en) * 1977-03-08 1981-02-17 Fuji Photo Film Co., Ltd. Disc jacket for retaining magnetic recording disc
US4180840A (en) * 1978-03-29 1979-12-25 Burroughs Corporation Cleaning disk assembly for oppositely-oriented, dual-component magnetic transducers
US4377831A (en) * 1979-03-15 1983-03-22 Innovative Computer Products Corp. Non-abrasive magnetic head cleaning system
DE3008137A1 (de) * 1979-03-15 1980-09-25 Innovative Computer Prod Vorrichtung und verfahren zum abriebfreien reinigen von magnetkoepfen
FR2451611A1 (fr) * 1979-03-15 1980-10-10 Innovative Computer Prod Procede et dispositif de nettoyage des tetes magnetiques des systemes a disque souple
US4291353A (en) * 1979-06-04 1981-09-22 Texas Instruments Incorporated System and method for cleaning a magnetic head transducer
US4419164A (en) * 1980-06-02 1983-12-06 Verbatim Corporation Method for making a self-lubricating liner
US4354213A (en) * 1980-06-02 1982-10-12 Verbatim Corporation Self-lubricating liner
WO1982000731A1 (en) * 1980-08-25 1982-03-04 Computer Prod Innovative Non-abrasive magnetic head cleaning system
US4374404A (en) * 1980-08-25 1983-02-15 Innovative Computer Products Corp. Non-abrasive magnetic head cleaning system
EP0056317A1 (en) * 1981-01-14 1982-07-21 Verbatim Corporation Cleaning disk assembly, cleaning disk and envelope
WO1982002612A1 (en) * 1981-01-16 1982-08-05 Kingsbury Philip Charles Orlando Floppy disc drive head cleaner
EP0056720A1 (en) * 1981-01-16 1982-07-28 Automation Facilities Limited Floppy disc drive head cleaner
EP0076064A1 (en) * 1981-09-16 1983-04-06 Dysan Corporation Improved removable disk cartridge
US4532564A (en) * 1981-09-16 1985-07-30 Dysan Corporation Removable disk cartridge
EP0161720A3 (en) * 1981-09-16 1986-01-08 Dysan Corporation Improved removable disk cartridge
US4499516A (en) * 1982-02-08 1985-02-12 Perfect Data Corporation Cleaning disk with opaque ring
US4516176A (en) * 1982-05-10 1985-05-07 Verbatim Corporation Magnetic head cleaning diskette
US4558386A (en) * 1982-06-04 1985-12-10 Ssk Enterprises, Inc. Head cleaner for floppy disk drive
US4589044A (en) * 1983-04-19 1986-05-13 Minnesota Mining And Manufacturing Company Head-cleaning diskette having jacket with removable tab
US4490765A (en) * 1983-09-01 1984-12-25 Yoshiro Nakamats Diskette for cleaning a floppy-disc drive head
EP0148580A1 (en) * 1983-11-18 1985-07-17 Ryan Plastics Ireland Limited Cleaning apparatus for a disc drive
US4916564A (en) * 1983-11-18 1990-04-10 Ryan Plastics Ireland Limited Cleaning apparatus for a disc drive
US4734145A (en) * 1985-02-22 1988-03-29 Visa Technologies, Inc. Method for making a magnetic transducer head cleaning card
US4704648A (en) * 1985-03-12 1987-11-03 Visa Technologies, Inc. Laminated head cleaning disk
US4755246A (en) * 1985-03-12 1988-07-05 Visa Technologies, Inc. Method of making a laminated head cleaning disk
US4868699A (en) * 1985-03-27 1989-09-19 Automation Facilities Limited Microfloppy disc drive head cleaner
US4845583A (en) * 1987-05-07 1989-07-04 Bonar Fabrics Corporation Record diskette or disk jackets lined with powder bonded nonwoven fabrics
US5060105A (en) * 1990-04-16 1991-10-22 International Paper Company Hybrid nonwoven diskette liner
US5311389A (en) * 1990-04-16 1994-05-10 International Paper Company Hydroentangled fabric diskette liner
US5355271A (en) * 1992-02-07 1994-10-11 Matsushita Electric Industrial Co., Ltd. Tape cassette with resiliently mounted tape cleaner
US5398151A (en) * 1993-10-29 1995-03-14 Minnesota Mining And Manufacturing Company Diskette liner
US5695374A (en) * 1994-09-21 1997-12-09 Kao Corporation Nonwoven fabric for liners of floppy disk and process for producing the same
US6075682A (en) * 1998-07-08 2000-06-13 Bba Nonwovens Simpsonville, Inc. Diskette liner with film and web layers
US20160122593A1 (en) * 2013-06-26 2016-05-05 Nitto Denko Corporation Adhesive tape for preventing aquatic biofouling

Also Published As

Publication number Publication date
DE2641943A1 (de) 1977-03-24
JPS5242628U (enrdf_load_stackoverflow) 1977-03-26
CA1072678A (en) 1980-02-26
JPS5554822Y2 (enrdf_load_stackoverflow) 1980-12-18
DE2641943C2 (de) 1987-03-12

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